Permanent magnet synchronous motor and screw rod compressor containing permanent magnet synchronous motor

Abstract

A permanent magnet synchronous motor and a screw rod compressor containing the permanent magnet synchronous motor belong to the technical field of motor heat radiation. The permanent magnet synchronous motor comprises a motor shell, a motor rear cover, a motor stator, a motor rotor and a motor shaft, wherein the motor rear cover is mounted at the end part of one end of the motor shell along the length direction; the motor stator is arranged in the cavity of the motor shell and is fixedly connected with the inner wall of the motor shell; the motor rotor sleeves the motor shaft; the motor rotor is arranged in the cavity of the motor stator and a gap is kept between the motor rotor and the motor stator. The permanent magnet synchronous motor is characterized in that a volute-free centrifugal fan is mounted on the side face, far away from one side of the motor rear cover, of the motor rotor; the volute-free centrifugal fan is arranged into the end part of the other end of the motor shell in the length direction and can rotate coaxially along the motor rotor. The permanent magnet synchronous motor further comprises the screw rod compressor containing the permanent magnet synchronous motor. The permanent magnet synchronous motor has the advantages of compact structure and good motor cooling effect; meanwhile, airflow noises of the motor and the fan power consumption can be reduced, so that the work of the compressor is more stable and the service life is long.

Description

technical field [0001] The invention belongs to the technical field of motor heat dissipation, and in particular relates to a permanent magnet synchronous motor, and also relates to a screw compressor including the permanent magnet synchronous motor. Background technique [0002] The permanent magnet synchronous motor has the characteristics of small size, high overall operating efficiency, high power factor, large starting torque, good force index, and low temperature rise, so it has been used in the drive of compressors in recent years. Compared with the traditional motor, the permanent magnet synchronous motor adopts the permanent magnet in the motor rotor for excitation, which can avoid the excitation loss caused by the magnetic field generated by the excitation current. The disadvantage is that it is necessary to take forced heat dissipation measures to take away the heat inside the permanent magnet synchronous motor To avoid the demagnetization of permanent magnets cau...

AI Technical Summary

Problems solved by technology

Compared with the traditional motor, the permanent magnet synchronous motor adopts the permanent magnet in the motor rotor for excitation, which can avoid the excitation loss caused by the magnetic field generated by the excitation current. The disadvantage is that it is necessary to take forced heat dissipation measures to take away the heat inside the permanent magnet synchronous motor To avoid demagnetization of permanent magnets caused by long-term high temperature working environment

For permanent magnet synchronous motors, when the motor is working with frequency conversion, especially when it is running at high frequency, there are relatively prominent problems such as large noise generated by the airflow and high power consumption. Improved cooling structure

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